shithub: libvpx

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Rescale arf bit budget calculation

To compute the total budget for a depth layer, exclude the count of
frames that have been allocated the bit budget. This improves the
avg PSNR by 0.15% and overall PSNR by 0.25% for lowres and midres
test sets.

Change-Id: I5115e33e1422dc930179142cd29aeebe97425283

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -2301,8 +2301,9 @@

     for (idx = 2; idx < MAX_ARF_LAYERS; ++idx) {

       if (arf_depth_boost[idx] == 0) break;

-      arf_depth_bits[idx] = calculate_boost_bits(

-          rc->baseline_gf_interval, arf_depth_boost[idx], total_group_bits);

+      arf_depth_bits[idx] =

+          calculate_boost_bits(rc->baseline_gf_interval - total_arfs,

+                               arf_depth_boost[idx], total_group_bits);

       total_group_bits -= arf_depth_bits[idx];

       total_arfs += arf_depth_count[idx];